Finding the Fourth Proportional to 478,498.51, 660,423.27 and 274,687.12

Step by Step Solution

1. Step 1: Write the proportion equation
   478,498.51 : 660,423.27 = 274,687.12 : x
2. Step 2: Convert to fraction form
   478,498.51/660,423.27 = 274,687.12/x
3. Step 3: Cross multiply
   478,498.51x = 660,423.27 × 274,687.12
4. Step 4: Simplify right side
   478,498.51x = 181,409,766,017.28
5. Step 5: Solve for x
   x = 181,409,766,017.28/478,498.51
6. Step 6: Final answer
   x = 379,122.95