Finding the Fourth Proportional to 1,405.55, 2,105.63 and 787.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.55 : 2,105.63 = 787.38 : x
2. Step 2: Convert to fraction form
   1,405.55/2,105.63 = 787.38/x
3. Step 3: Cross multiply
   1,405.55x = 2,105.63 × 787.38
4. Step 4: Simplify right side
   1,405.55x = 1,657,930.95
5. Step 5: Solve for x
   x = 1,657,930.95/1,405.55
6. Step 6: Final answer
   x = 1,179.56