Finding the Fourth Proportional to 139.55, 209.20 and 62.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.55 : 209.20 = 62.50 : x
2. Step 2: Convert to fraction form
   139.55/209.20 = 62.50/x
3. Step 3: Cross multiply
   139.55x = 209.20 × 62.50
4. Step 4: Simplify right side
   139.55x = 13,075
5. Step 5: Solve for x
   x = 13,075/139.55
6. Step 6: Final answer
   x = 93.69