Finding the Fourth Proportional to 72.42, 99.90 and 49.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 99.90 = 49.02 : x
2. Step 2: Convert to fraction form
   72.42/99.90 = 49.02/x
3. Step 3: Cross multiply
   72.42x = 99.90 × 49.02
4. Step 4: Simplify right side
   72.42x = 4,897.10
5. Step 5: Solve for x
   x = 4,897.10/72.42
6. Step 6: Final answer
   x = 67.62