Finding the Fourth Proportional to 99,770.72, 137,683.68 and 55,058.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,770.72 : 137,683.68 = 55,058.72 : x
2. Step 2: Convert to fraction form
   99,770.72/137,683.68 = 55,058.72/x
3. Step 3: Cross multiply
   99,770.72x = 137,683.68 × 55,058.72
4. Step 4: Simplify right side
   99,770.72x = 7,580,687,185.69
5. Step 5: Solve for x
   x = 7,580,687,185.69/99,770.72
6. Step 6: Final answer
   x = 75,981.08