Finding the Fourth Proportional to 1,056.90, 1,458.71 and 615.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.90 : 1,458.71 = 615.06 : x
2. Step 2: Convert to fraction form
   1,056.90/1,458.71 = 615.06/x
3. Step 3: Cross multiply
   1,056.90x = 1,458.71 × 615.06
4. Step 4: Simplify right side
   1,056.90x = 897,194.17
5. Step 5: Solve for x
   x = 897,194.17/1,056.90
6. Step 6: Final answer
   x = 848.89