Finding the Fourth Proportional to 70,217.07, 105,352.20 and 42,156.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,217.07 : 105,352.20 = 42,156.72 : x
2. Step 2: Convert to fraction form
   70,217.07/105,352.20 = 42,156.72/x
3. Step 3: Cross multiply
   70,217.07x = 105,352.20 × 42,156.72
4. Step 4: Simplify right side
   70,217.07x = 4,441,303,196.78
5. Step 5: Solve for x
   x = 4,441,303,196.78/70,217.07
6. Step 6: Final answer
   x = 63,251.05