Finding the Fourth Proportional to 1,376.82, 1,899.90 and 787.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.82 : 1,899.90 = 787.50 : x
2. Step 2: Convert to fraction form
   1,376.82/1,899.90 = 787.50/x
3. Step 3: Cross multiply
   1,376.82x = 1,899.90 × 787.50
4. Step 4: Simplify right side
   1,376.82x = 1,496,171.25
5. Step 5: Solve for x
   x = 1,496,171.25/1,376.82
6. Step 6: Final answer
   x = 1,086.69