Finding the Fourth Proportional to 478,386,062.55, 671,554,472.85 and 478,386,062.55

Step by Step Solution

1. Step 1: Write the proportion equation
   478,386,062.55 : 671,554,472.85 = 478,386,062.55 : x
2. Step 2: Convert to fraction form
   478,386,062.55/671,554,472.85 = 478,386,062.55/x
3. Step 3: Cross multiply
   478,386,062.55x = 671,554,472.85 × 478,386,062.55
4. Step 4: Simplify right side
   478,386,062.55x = 321,262,300,054,552,384
5. Step 5: Solve for x
   x = 321,262,300,054,552,384/478,386,062.55
6. Step 6: Final answer
   x = 671,554,472.85