Finding the Fourth Proportional to 99,337.68, 137,088.66 and 54,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,337.68 : 137,088.66 = 54,018.72 : x
2. Step 2: Convert to fraction form
   99,337.68/137,088.66 = 54,018.72/x
3. Step 3: Cross multiply
   99,337.68x = 137,088.66 × 54,018.72
4. Step 4: Simplify right side
   99,337.68x = 7,405,353,939.72
5. Step 5: Solve for x
   x = 7,405,353,939.72/99,337.68
6. Step 6: Final answer
   x = 74,547.28