Finding the Fourth Proportional to 109,061.20, 163,543.20 and 42,479.20

Step by Step Solution

1. Step 1: Write the proportion equation
   109,061.20 : 163,543.20 = 42,479.20 : x
2. Step 2: Convert to fraction form
   109,061.20/163,543.20 = 42,479.20/x
3. Step 3: Cross multiply
   109,061.20x = 163,543.20 × 42,479.20
4. Step 4: Simplify right side
   109,061.20x = 6,947,184,301.44
5. Step 5: Solve for x
   x = 6,947,184,301.44/109,061.20
6. Step 6: Final answer
   x = 63,699.87