Finding the Fourth Proportional to 99,760.51, 137,557.87 and 81,554.41

Step by Step Solution

1. Step 1: Write the proportion equation
   99,760.51 : 137,557.87 = 81,554.41 : x
2. Step 2: Convert to fraction form
   99,760.51/137,557.87 = 81,554.41/x
3. Step 3: Cross multiply
   99,760.51x = 137,557.87 × 81,554.41
4. Step 4: Simplify right side
   99,760.51x = 11,218,450,928.71
5. Step 5: Solve for x
   x = 11,218,450,928.71/99,760.51
6. Step 6: Final answer
   x = 112,453.82