Finding the Fourth Proportional to 100.90, 139.25 and 59.46

Step by Step Solution

1. Step 1: Write the proportion equation
   100.90 : 139.25 = 59.46 : x
2. Step 2: Convert to fraction form
   100.90/139.25 = 59.46/x
3. Step 3: Cross multiply
   100.90x = 139.25 × 59.46
4. Step 4: Simplify right side
   100.90x = 8,279.10
5. Step 5: Solve for x
   x = 8,279.10/100.90
6. Step 6: Final answer
   x = 82.05