Finding the Fourth Proportional to 381,298.32, 571,801.82 and 128,510.89

Step by Step Solution

1. Step 1: Write the proportion equation
   381,298.32 : 571,801.82 = 128,510.89 : x
2. Step 2: Convert to fraction form
   381,298.32/571,801.82 = 128,510.89/x
3. Step 3: Cross multiply
   381,298.32x = 571,801.82 × 128,510.89
4. Step 4: Simplify right side
   381,298.32x = 73,482,758,719.76
5. Step 5: Solve for x
   x = 73,482,758,719.76/381,298.32
6. Step 6: Final answer
   x = 192,717.24