Finding the Fourth Proportional to 99,289.76, 137,019.86 and 54,577.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,289.76 : 137,019.86 = 54,577.76 : x
2. Step 2: Convert to fraction form
   99,289.76/137,019.86 = 54,577.76/x
3. Step 3: Cross multiply
   99,289.76x = 137,019.86 × 54,577.76
4. Step 4: Simplify right side
   99,289.76x = 7,478,237,034.31
5. Step 5: Solve for x
   x = 7,478,237,034.31/99,289.76
6. Step 6: Final answer
   x = 75,317.30