Finding the Fourth Proportional to 99,425.61, 137,207.59 and 54,103.57

Step by Step Solution

1. Step 1: Write the proportion equation
   99,425.61 : 137,207.59 = 54,103.57 : x
2. Step 2: Convert to fraction form
   99,425.61/137,207.59 = 54,103.57/x
3. Step 3: Cross multiply
   99,425.61x = 137,207.59 × 54,103.57
4. Step 4: Simplify right side
   99,425.61x = 7,423,419,971.82
5. Step 5: Solve for x
   x = 7,423,419,971.82/99,425.61
6. Step 6: Final answer
   x = 74,663.06