Finding the Fourth Proportional to 99,415.72, 137,189.56 and 54,093.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,415.72 : 137,189.56 = 54,093.88 : x
2. Step 2: Convert to fraction form
   99,415.72/137,189.56 = 54,093.88/x
3. Step 3: Cross multiply
   99,415.72x = 137,189.56 × 54,093.88
4. Step 4: Simplify right side
   99,415.72x = 7,421,115,595.89
5. Step 5: Solve for x
   x = 7,421,115,595.89/99,415.72
6. Step 6: Final answer
   x = 74,647.31