Finding the Fourth Proportional to 139.51, 209.31 and 62.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.51 : 209.31 = 62.50 : x
2. Step 2: Convert to fraction form
   139.51/209.31 = 62.50/x
3. Step 3: Cross multiply
   139.51x = 209.31 × 62.50
4. Step 4: Simplify right side
   139.51x = 13,080.52
5. Step 5: Solve for x
   x = 13,080.52/139.51
6. Step 6: Final answer
   x = 93.76