Finding the Fourth Proportional to 81,702.21, 112,735.83 and 51,071.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,702.21 : 112,735.83 = 51,071.72 : x
2. Step 2: Convert to fraction form
   81,702.21/112,735.83 = 51,071.72/x
3. Step 3: Cross multiply
   81,702.21x = 112,735.83 × 51,071.72
4. Step 4: Simplify right side
   81,702.21x = 5,757,612,743.73
5. Step 5: Solve for x
   x = 5,757,612,743.73/81,702.21
6. Step 6: Final answer
   x = 70,470.71