Finding the Fourth Proportional to 47,257.34, 70,899.86 and 13,978.29

Step by Step Solution

1. Step 1: Write the proportion equation
   47,257.34 : 70,899.86 = 13,978.29 : x
2. Step 2: Convert to fraction form
   47,257.34/70,899.86 = 13,978.29/x
3. Step 3: Cross multiply
   47,257.34x = 70,899.86 × 13,978.29
4. Step 4: Simplify right side
   47,257.34x = 991,058,734.15
5. Step 5: Solve for x
   x = 991,058,734.15/47,257.34
6. Step 6: Final answer
   x = 20,971.53