Finding the Fourth Proportional to 1,377.17, 1,899.95 and 787.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.17 : 1,899.95 = 787.39 : x
2. Step 2: Convert to fraction form
   1,377.17/1,899.95 = 787.39/x
3. Step 3: Cross multiply
   1,377.17x = 1,899.95 × 787.39
4. Step 4: Simplify right side
   1,377.17x = 1,495,990.16
5. Step 5: Solve for x
   x = 1,495,990.16/1,377.17
6. Step 6: Final answer
   x = 1,086.28