Finding the Fourth Proportional to 99,858.72, 137,806.14 and 54,538.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99,858.72 : 137,806.14 = 54,538.06 : x
2. Step 2: Convert to fraction form
   99,858.72/137,806.14 = 54,538.06/x
3. Step 3: Cross multiply
   99,858.72x = 137,806.14 × 54,538.06
4. Step 4: Simplify right side
   99,858.72x = 7,515,679,531.69
5. Step 5: Solve for x
   x = 7,515,679,531.69/99,858.72
6. Step 6: Final answer
   x = 75,263.13