Finding the Fourth Proportional to 72.38, 99.86 and 52.98

Step by Step Solution

1. Step 1: Write the proportion equation
   72.38 : 99.86 = 52.98 : x
2. Step 2: Convert to fraction form
   72.38/99.86 = 52.98/x
3. Step 3: Cross multiply
   72.38x = 99.86 × 52.98
4. Step 4: Simplify right side
   72.38x = 5,290.58
5. Step 5: Solve for x
   x = 5,290.58/72.38
6. Step 6: Final answer
   x = 73.09