Finding the Fourth Proportional to 89,912.69, 124,129.23 and 54,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,912.69 : 124,129.23 = 54,111.50 : x
2. Step 2: Convert to fraction form
   89,912.69/124,129.23 = 54,111.50/x
3. Step 3: Cross multiply
   89,912.69x = 124,129.23 × 54,111.50
4. Step 4: Simplify right side
   89,912.69x = 6,716,818,829.15
5. Step 5: Solve for x
   x = 6,716,818,829.15/89,912.69
6. Step 6: Final answer
   x = 74,703.79