Finding the Fourth Proportional to 90,279.05, 124,690.46 and 72,192.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90,279.05 : 124,690.46 = 72,192.15 : x
2. Step 2: Convert to fraction form
   90,279.05/124,690.46 = 72,192.15/x
3. Step 3: Cross multiply
   90,279.05x = 124,690.46 × 72,192.15
4. Step 4: Simplify right side
   90,279.05x = 9,001,672,030.93
5. Step 5: Solve for x
   x = 9,001,672,030.93/90,279.05
6. Step 6: Final answer
   x = 99,709.43