Finding the Fourth Proportional to 99,758.71, 137,662.73 and 54,435.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99,758.71 : 137,662.73 = 54,435.56 : x
2. Step 2: Convert to fraction form
   99,758.71/137,662.73 = 54,435.56/x
3. Step 3: Cross multiply
   99,758.71x = 137,662.73 × 54,435.56
4. Step 4: Simplify right side
   99,758.71x = 7,493,748,278.92
5. Step 5: Solve for x
   x = 7,493,748,278.92/99,758.71
6. Step 6: Final answer
   x = 75,118.74