Finding the Fourth Proportional to 85,470.69, 128,221.53 and 42,798.37

Step by Step Solution

1. Step 1: Write the proportion equation
   85,470.69 : 128,221.53 = 42,798.37 : x
2. Step 2: Convert to fraction form
   85,470.69/128,221.53 = 42,798.37/x
3. Step 3: Cross multiply
   85,470.69x = 128,221.53 × 42,798.37
4. Step 4: Simplify right side
   85,470.69x = 5,487,672,268.91
5. Step 5: Solve for x
   x = 5,487,672,268.91/85,470.69
6. Step 6: Final answer
   x = 64,205.31