Finding the Fourth Proportional to 109,440.10, 164,160.15 and 42,858.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109,440.10 : 164,160.15 = 42,858.10 : x
2. Step 2: Convert to fraction form
   109,440.10/164,160.15 = 42,858.10/x
3. Step 3: Cross multiply
   109,440.10x = 164,160.15 × 42,858.10
4. Step 4: Simplify right side
   109,440.10x = 7,035,592,124.72
5. Step 5: Solve for x
   x = 7,035,592,124.72/109,440.10
6. Step 6: Final answer
   x = 64,287.15