Finding the Fourth Proportional to 67,128.88, 100,902.52 and 42,328.30

Step by Step Solution

1. Step 1: Write the proportion equation
   67,128.88 : 100,902.52 = 42,328.30 : x
2. Step 2: Convert to fraction form
   67,128.88/100,902.52 = 42,328.30/x
3. Step 3: Cross multiply
   67,128.88x = 100,902.52 × 42,328.30
4. Step 4: Simplify right side
   67,128.88x = 4,271,032,137.32
5. Step 5: Solve for x
   x = 4,271,032,137.32/67,128.88
6. Step 6: Final answer
   x = 63,624.36