Finding the Fourth Proportional to 99,802.80, 137,716.20 and 59,518.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,802.80 : 137,716.20 = 59,518.80 : x
2. Step 2: Convert to fraction form
   99,802.80/137,716.20 = 59,518.80/x
3. Step 3: Cross multiply
   99,802.80x = 137,716.20 × 59,518.80
4. Step 4: Simplify right side
   99,802.80x = 8,196,702,964.56
5. Step 5: Solve for x
   x = 8,196,702,964.56/99,802.80
6. Step 6: Final answer
   x = 82,128.99