Finding the Fourth Proportional to 78,680.68, 108,619.50 and 53,321

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.68 : 108,619.50 = 53,321 : x
2. Step 2: Convert to fraction form
   78,680.68/108,619.50 = 53,321/x
3. Step 3: Cross multiply
   78,680.68x = 108,619.50 × 53,321
4. Step 4: Simplify right side
   78,680.68x = 5,791,700,359.50
5. Step 5: Solve for x
   x = 5,791,700,359.50/78,680.68
6. Step 6: Final answer
   x = 73,610.20