Finding the Fourth Proportional to 99,128, 136,705.89 and 65,123

Step by Step Solution

1. Step 1: Write the proportion equation
   99,128 : 136,705.89 = 65,123 : x
2. Step 2: Convert to fraction form
   99,128/136,705.89 = 65,123/x
3. Step 3: Cross multiply
   99,128x = 136,705.89 × 65,123
4. Step 4: Simplify right side
   99,128x = 8,902,697,674.47
5. Step 5: Solve for x
   x = 8,902,697,674.47/99,128
6. Step 6: Final answer
   x = 89,810.12