Finding the Fourth Proportional to 99.98, 137.98 and 56.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99.98 : 137.98 = 56.32 : x
2. Step 2: Convert to fraction form
   99.98/137.98 = 56.32/x
3. Step 3: Cross multiply
   99.98x = 137.98 × 56.32
4. Step 4: Simplify right side
   99.98x = 7,771.03
5. Step 5: Solve for x
   x = 7,771.03/99.98
6. Step 6: Final answer
   x = 77.73