Finding the Fourth Proportional to 120,108,381.12, 165,302,761.56 and 99,031,824.72

Step by Step Solution

1. Step 1: Write the proportion equation
   120,108,381.12 : 165,302,761.56 = 99,031,824.72 : x
2. Step 2: Convert to fraction form
   120,108,381.12/165,302,761.56 = 99,031,824.72/x
3. Step 3: Cross multiply
   120,108,381.12x = 165,302,761.56 × 99,031,824.72
4. Step 4: Simplify right side
   120,108,381.12x = 16,370,234,108,541,874
5. Step 5: Solve for x
   x = 16,370,234,108,541,874/120,108,381.12
6. Step 6: Final answer
   x = 136,295,518.73