Finding the Fourth Proportional to 70,219.07, 105,355.20 and 42,158.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,219.07 : 105,355.20 = 42,158.72 : x
2. Step 2: Convert to fraction form
   70,219.07/105,355.20 = 42,158.72/x
3. Step 3: Cross multiply
   70,219.07x = 105,355.20 × 42,158.72
4. Step 4: Simplify right side
   70,219.07x = 4,441,640,377.34
5. Step 5: Solve for x
   x = 4,441,640,377.34/70,219.07
6. Step 6: Final answer
   x = 63,254.05