Finding the Fourth Proportional to 78,978.51, 108,990.56 and 47,146.73

Step by Step Solution

1. Step 1: Write the proportion equation
   78,978.51 : 108,990.56 = 47,146.73 : x
2. Step 2: Convert to fraction form
   78,978.51/108,990.56 = 47,146.73/x
3. Step 3: Cross multiply
   78,978.51x = 108,990.56 × 47,146.73
4. Step 4: Simplify right side
   78,978.51x = 5,138,548,077.78
5. Step 5: Solve for x
   x = 5,138,548,077.78/78,978.51
6. Step 6: Final answer
   x = 65,062.61