Finding the Fourth Proportional to 1,385.56, 2,076.72 and 615.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.56 : 2,076.72 = 615.52 : x
2. Step 2: Convert to fraction form
   1,385.56/2,076.72 = 615.52/x
3. Step 3: Cross multiply
   1,385.56x = 2,076.72 × 615.52
4. Step 4: Simplify right side
   1,385.56x = 1,278,262.69
5. Step 5: Solve for x
   x = 1,278,262.69/1,385.56
6. Step 6: Final answer
   x = 922.56