Finding the Fourth Proportional to 1,402.76, 1,935.90 and 781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.76 : 1,935.90 = 781.72 : x
2. Step 2: Convert to fraction form
   1,402.76/1,935.90 = 781.72/x
3. Step 3: Cross multiply
   1,402.76x = 1,935.90 × 781.72
4. Step 4: Simplify right side
   1,402.76x = 1,513,331.75
5. Step 5: Solve for x
   x = 1,513,331.75/1,402.76
6. Step 6: Final answer
   x = 1,078.82