Finding the Fourth Proportional to 100.37, 138.50 and 56.10

Step by Step Solution

1. Step 1: Write the proportion equation
   100.37 : 138.50 = 56.10 : x
2. Step 2: Convert to fraction form
   100.37/138.50 = 56.10/x
3. Step 3: Cross multiply
   100.37x = 138.50 × 56.10
4. Step 4: Simplify right side
   100.37x = 7,769.57
5. Step 5: Solve for x
   x = 7,769.57/100.37
6. Step 6: Final answer
   x = 77.41