Finding the Fourth Proportional to 342,280.10, 472,201.90 and 229,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   342,280.10 : 472,201.90 = 229,139.30 : x
2. Step 2: Convert to fraction form
   342,280.10/472,201.90 = 229,139.30/x
3. Step 3: Cross multiply
   342,280.10x = 472,201.90 × 229,139.30
4. Step 4: Simplify right side
   342,280.10x = 108,200,009,890.81
5. Step 5: Solve for x
   x = 108,200,009,890.81/342,280.10
6. Step 6: Final answer
   x = 316,115.40