Finding the Fourth Proportional to 231,219.41, 346,856.88 and 81,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   231,219.41 : 346,856.88 = 81,428.72 : x
2. Step 2: Convert to fraction form
   231,219.41/346,856.88 = 81,428.72/x
3. Step 3: Cross multiply
   231,219.41x = 346,856.88 × 81,428.72
4. Step 4: Simplify right side
   231,219.41x = 28,244,111,761.59
5. Step 5: Solve for x
   x = 28,244,111,761.59/231,219.41
6. Step 6: Final answer
   x = 122,152.86