Finding the Fourth Proportional to 99,111.40, 136,773.79 and 53,789.37

Step by Step Solution

1. Step 1: Write the proportion equation
   99,111.40 : 136,773.79 = 53,789.37 : x
2. Step 2: Convert to fraction form
   99,111.40/136,773.79 = 53,789.37/x
3. Step 3: Cross multiply
   99,111.40x = 136,773.79 × 53,789.37
4. Step 4: Simplify right side
   99,111.40x = 7,356,975,312.74
5. Step 5: Solve for x
   x = 7,356,975,312.74/99,111.40
6. Step 6: Final answer
   x = 74,229.36