Finding the Fourth Proportional to 99,768.32, 137,683.17 and 54,449.21

Step by Step Solution

1. Step 1: Write the proportion equation
   99,768.32 : 137,683.17 = 54,449.21 : x
2. Step 2: Convert to fraction form
   99,768.32/137,683.17 = 54,449.21/x
3. Step 3: Cross multiply
   99,768.32x = 137,683.17 × 54,449.21
4. Step 4: Simplify right side
   99,768.32x = 7,496,739,148.38
5. Step 5: Solve for x
   x = 7,496,739,148.38/99,768.32
6. Step 6: Final answer
   x = 75,141.48