Finding the Fourth Proportional to 81,851.98, 112,971.24 and 51,239.30

Step by Step Solution

1. Step 1: Write the proportion equation
   81,851.98 : 112,971.24 = 51,239.30 : x
2. Step 2: Convert to fraction form
   81,851.98/112,971.24 = 51,239.30/x
3. Step 3: Cross multiply
   81,851.98x = 112,971.24 × 51,239.30
4. Step 4: Simplify right side
   81,851.98x = 5,788,566,847.21
5. Step 5: Solve for x
   x = 5,788,566,847.21/81,851.98
6. Step 6: Final answer
   x = 70,719.94