Finding the Fourth Proportional to 128,122,298.63, 192,490,042.71 and 82,154,229.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,122,298.63 : 192,490,042.71 = 82,154,229.50 : x
2. Step 2: Convert to fraction form
   128,122,298.63/192,490,042.71 = 82,154,229.50/x
3. Step 3: Cross multiply
   128,122,298.63x = 192,490,042.71 × 82,154,229.50
4. Step 4: Simplify right side
   128,122,298.63x = 15,813,871,144,299,694
5. Step 5: Solve for x
   x = 15,813,871,144,299,694/128,122,298.63
6. Step 6: Final answer
   x = 123,427,938.10