Finding the Fourth Proportional to 121,419.96, 167,575.98 and 71,139

Step by Step Solution

1. Step 1: Write the proportion equation
   121,419.96 : 167,575.98 = 71,139 : x
2. Step 2: Convert to fraction form
   121,419.96/167,575.98 = 71,139/x
3. Step 3: Cross multiply
   121,419.96x = 167,575.98 × 71,139
4. Step 4: Simplify right side
   121,419.96x = 11,921,187,641.22
5. Step 5: Solve for x
   x = 11,921,187,641.22/121,419.96
6. Step 6: Final answer
   x = 98,181.45