Finding the Fourth Proportional to 99.83, 137.77 and 56.17

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 137.77 = 56.17 : x
2. Step 2: Convert to fraction form
   99.83/137.77 = 56.17/x
3. Step 3: Cross multiply
   99.83x = 137.77 × 56.17
4. Step 4: Simplify right side
   99.83x = 7,738.54
5. Step 5: Solve for x
   x = 7,738.54/99.83
6. Step 6: Final answer
   x = 77.52