Finding the Fourth Proportional to 913,800.56, 1,370,256.77 and 458,196.05

Step by Step Solution

1. Step 1: Write the proportion equation
   913,800.56 : 1,370,256.77 = 458,196.05 : x
2. Step 2: Convert to fraction form
   913,800.56/1,370,256.77 = 458,196.05/x
3. Step 3: Cross multiply
   913,800.56x = 1,370,256.77 × 458,196.05
4. Step 4: Simplify right side
   913,800.56x = 627,846,244,070.89
5. Step 5: Solve for x
   x = 627,846,244,070.89/913,800.56
6. Step 6: Final answer
   x = 687,071.42