Finding the Fourth Proportional to 100.52, 138.72 and 59.07

Step by Step Solution

1. Step 1: Write the proportion equation
   100.52 : 138.72 = 59.07 : x
2. Step 2: Convert to fraction form
   100.52/138.72 = 59.07/x
3. Step 3: Cross multiply
   100.52x = 138.72 × 59.07
4. Step 4: Simplify right side
   100.52x = 8,194.19
5. Step 5: Solve for x
   x = 8,194.19/100.52
6. Step 6: Final answer
   x = 81.52