Finding the Fourth Proportional to 70,214.89, 96,872.89 and 39,978.83

Step by Step Solution

1. Step 1: Write the proportion equation
   70,214.89 : 96,872.89 = 39,978.83 : x
2. Step 2: Convert to fraction form
   70,214.89/96,872.89 = 39,978.83/x
3. Step 3: Cross multiply
   70,214.89x = 96,872.89 × 39,978.83
4. Step 4: Simplify right side
   70,214.89x = 3,872,864,116.66
5. Step 5: Solve for x
   x = 3,872,864,116.66/70,214.89
6. Step 6: Final answer
   x = 55,157.31