Finding the Fourth Proportional to 99,766.72, 137,678.16 and 55,054.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,766.72 : 137,678.16 = 55,054.72 : x
2. Step 2: Convert to fraction form
   99,766.72/137,678.16 = 55,054.72/x
3. Step 3: Cross multiply
   99,766.72x = 137,678.16 × 55,054.72
4. Step 4: Simplify right side
   99,766.72x = 7,579,832,548.92
5. Step 5: Solve for x
   x = 7,579,832,548.92/99,766.72
6. Step 6: Final answer
   x = 75,975.56