Finding the Fourth Proportional to 112,128.90, 168,258.15 and 42,015.30

Step by Step Solution

1. Step 1: Write the proportion equation
   112,128.90 : 168,258.15 = 42,015.30 : x
2. Step 2: Convert to fraction form
   112,128.90/168,258.15 = 42,015.30/x
3. Step 3: Cross multiply
   112,128.90x = 168,258.15 × 42,015.30
4. Step 4: Simplify right side
   112,128.90x = 7,069,416,649.70
5. Step 5: Solve for x
   x = 7,069,416,649.70/112,128.90
6. Step 6: Final answer
   x = 63,047.23