Finding the Fourth Proportional to 81,802.61, 112,919.76 and 51,581.91

Step by Step Solution

1. Step 1: Write the proportion equation
   81,802.61 : 112,919.76 = 51,581.91 : x
2. Step 2: Convert to fraction form
   81,802.61/112,919.76 = 51,581.91/x
3. Step 3: Cross multiply
   81,802.61x = 112,919.76 × 51,581.91
4. Step 4: Simplify right side
   81,802.61x = 5,824,616,639.63
5. Step 5: Solve for x
   x = 5,824,616,639.63/81,802.61
6. Step 6: Final answer
   x = 71,203.31