Finding the Fourth Proportional to 100.84, 139.15 and 59.39

Step by Step Solution

1. Step 1: Write the proportion equation
   100.84 : 139.15 = 59.39 : x
2. Step 2: Convert to fraction form
   100.84/139.15 = 59.39/x
3. Step 3: Cross multiply
   100.84x = 139.15 × 59.39
4. Step 4: Simplify right side
   100.84x = 8,264.12
5. Step 5: Solve for x
   x = 8,264.12/100.84
6. Step 6: Final answer
   x = 81.95