Finding the Fourth Proportional to 99.83, 137.72 and 60.47

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 137.72 = 60.47 : x
2. Step 2: Convert to fraction form
   99.83/137.72 = 60.47/x
3. Step 3: Cross multiply
   99.83x = 137.72 × 60.47
4. Step 4: Simplify right side
   99.83x = 8,326.94
5. Step 5: Solve for x
   x = 8,326.94/99.83
6. Step 6: Final answer
   x = 83.42