Finding the Fourth Proportional to 99.51, 137.31 and 55.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.51 : 137.31 = 55.83 : x
2. Step 2: Convert to fraction form
   99.51/137.31 = 55.83/x
3. Step 3: Cross multiply
   99.51x = 137.31 × 55.83
4. Step 4: Simplify right side
   99.51x = 7,666.02
5. Step 5: Solve for x
   x = 7,666.02/99.51
6. Step 6: Final answer
   x = 77.04