Finding the Fourth Proportional to 100.63, 138.63 and 93.34

Step by Step Solution

1. Step 1: Write the proportion equation
   100.63 : 138.63 = 93.34 : x
2. Step 2: Convert to fraction form
   100.63/138.63 = 93.34/x
3. Step 3: Cross multiply
   100.63x = 138.63 × 93.34
4. Step 4: Simplify right side
   100.63x = 12,939.72
5. Step 5: Solve for x
   x = 12,939.72/100.63
6. Step 6: Final answer
   x = 128.59