Finding the Fourth Proportional to 438,223.72, 657,269.56 and 138,665.34

Step by Step Solution

1. Step 1: Write the proportion equation
   438,223.72 : 657,269.56 = 138,665.34 : x
2. Step 2: Convert to fraction form
   438,223.72/657,269.56 = 138,665.34/x
3. Step 3: Cross multiply
   438,223.72x = 657,269.56 × 138,665.34
4. Step 4: Simplify right side
   438,223.72x = 91,140,507,009.05
5. Step 5: Solve for x
   x = 91,140,507,009.05/438,223.72
6. Step 6: Final answer
   x = 207,977.12