Finding the Fourth Proportional to 99,426.42, 149,139.59 and 81,859.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,426.42 : 149,139.59 = 81,859.32 : x
2. Step 2: Convert to fraction form
   99,426.42/149,139.59 = 81,859.32/x
3. Step 3: Cross multiply
   99,426.42x = 149,139.59 × 81,859.32
4. Step 4: Simplify right side
   99,426.42x = 12,208,465,013.18
5. Step 5: Solve for x
   x = 12,208,465,013.18/99,426.42
6. Step 6: Final answer
   x = 122,788.94