Finding the Fourth Proportional to 1,402.89, 1,935.99 and 781.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.89 : 1,935.99 = 781.89 : x
2. Step 2: Convert to fraction form
   1,402.89/1,935.99 = 781.89/x
3. Step 3: Cross multiply
   1,402.89x = 1,935.99 × 781.89
4. Step 4: Simplify right side
   1,402.89x = 1,513,731.22
5. Step 5: Solve for x
   x = 1,513,731.22/1,402.89
6. Step 6: Final answer
   x = 1,079.01