Finding the Fourth Proportional to 139,100.71, 208,692.65 and 98,652.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,100.71 : 208,692.65 = 98,652.15 : x
2. Step 2: Convert to fraction form
   139,100.71/208,692.65 = 98,652.15/x
3. Step 3: Cross multiply
   139,100.71x = 208,692.65 × 98,652.15
4. Step 4: Simplify right side
   139,100.71x = 20,587,978,611.70
5. Step 5: Solve for x
   x = 20,587,978,611.70/139,100.71
6. Step 6: Final answer
   x = 148,007.72