Finding the Fourth Proportional to 1,056.78, 1,458.30 and 614.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.78 : 1,458.30 = 614.82 : x
2. Step 2: Convert to fraction form
   1,056.78/1,458.30 = 614.82/x
3. Step 3: Cross multiply
   1,056.78x = 1,458.30 × 614.82
4. Step 4: Simplify right side
   1,056.78x = 896,592.01
5. Step 5: Solve for x
   x = 896,592.01/1,056.78
6. Step 6: Final answer
   x = 848.42