Finding the Fourth Proportional to 99,729.72, 137,627.40 and 54,408.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,729.72 : 137,627.40 = 54,408.72 : x
2. Step 2: Convert to fraction form
   99,729.72/137,627.40 = 54,408.72/x
3. Step 3: Cross multiply
   99,729.72x = 137,627.40 × 54,408.72
4. Step 4: Simplify right side
   99,729.72x = 7,488,130,670.93
5. Step 5: Solve for x
   x = 7,488,130,670.93/99,729.72
6. Step 6: Final answer
   x = 75,084.24