Finding the Fourth Proportional to 1,347.53, 1,859.61 and 787.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.53 : 1,859.61 = 787.91 : x
2. Step 2: Convert to fraction form
   1,347.53/1,859.61 = 787.91/x
3. Step 3: Cross multiply
   1,347.53x = 1,859.61 × 787.91
4. Step 4: Simplify right side
   1,347.53x = 1,465,196.02
5. Step 5: Solve for x
   x = 1,465,196.02/1,347.53
6. Step 6: Final answer
   x = 1,087.32