Finding the Fourth Proportional to 215,953.31, 297,996.89 and 139,475.75

Step by Step Solution

1. Step 1: Write the proportion equation
   215,953.31 : 297,996.89 = 139,475.75 : x
2. Step 2: Convert to fraction form
   215,953.31/297,996.89 = 139,475.75/x
3. Step 3: Cross multiply
   215,953.31x = 297,996.89 × 139,475.75
4. Step 4: Simplify right side
   215,953.31x = 41,563,337,543.05
5. Step 5: Solve for x
   x = 41,563,337,543.05/215,953.31
6. Step 6: Final answer
   x = 192,464.46