Finding the Fourth Proportional to 1,056.88, 1,458.50 and 615.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.88 : 1,458.50 = 615.05 : x
2. Step 2: Convert to fraction form
   1,056.88/1,458.50 = 615.05/x
3. Step 3: Cross multiply
   1,056.88x = 1,458.50 × 615.05
4. Step 4: Simplify right side
   1,056.88x = 897,050.43
5. Step 5: Solve for x
   x = 897,050.43/1,056.88
6. Step 6: Final answer
   x = 848.77