Finding the Fourth Proportional to 1,376.90, 1,899.81 and 787.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.90 : 1,899.81 = 787.34 : x
2. Step 2: Convert to fraction form
   1,376.90/1,899.81 = 787.34/x
3. Step 3: Cross multiply
   1,376.90x = 1,899.81 × 787.34
4. Step 4: Simplify right side
   1,376.90x = 1,495,796.41
5. Step 5: Solve for x
   x = 1,495,796.41/1,376.90
6. Step 6: Final answer
   x = 1,086.35