Finding the Fourth Proportional to 90,245.31, 124,499.43 and 54,415.41

Step by Step Solution

1. Step 1: Write the proportion equation
   90,245.31 : 124,499.43 = 54,415.41 : x
2. Step 2: Convert to fraction form
   90,245.31/124,499.43 = 54,415.41/x
3. Step 3: Cross multiply
   90,245.31x = 124,499.43 × 54,415.41
4. Step 4: Simplify right side
   90,245.31x = 6,774,687,528.22
5. Step 5: Solve for x
   x = 6,774,687,528.22/90,245.31
6. Step 6: Final answer
   x = 75,069.69