Finding the Fourth Proportional to 139,184.66, 208,605.98 and 64,200.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,184.66 : 208,605.98 = 64,200.80 : x
2. Step 2: Convert to fraction form
   139,184.66/208,605.98 = 64,200.80/x
3. Step 3: Cross multiply
   139,184.66x = 208,605.98 × 64,200.80
4. Step 4: Simplify right side
   139,184.66x = 13,392,670,800.78
5. Step 5: Solve for x
   x = 13,392,670,800.78/139,184.66
6. Step 6: Final answer
   x = 96,222.32