Finding the Fourth Proportional to 1,007,866.55, 1,390,855.91 and 555,157.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007,866.55 : 1,390,855.91 = 555,157.55 : x
2. Step 2: Convert to fraction form
   1,007,866.55/1,390,855.91 = 555,157.55/x
3. Step 3: Cross multiply
   1,007,866.55x = 1,390,855.91 × 555,157.55
4. Step 4: Simplify right side
   1,007,866.55x = 772,144,155,399.17
5. Step 5: Solve for x
   x = 772,144,155,399.17/1,007,866.55
6. Step 6: Final answer
   x = 766,117.46