Finding the Fourth Proportional to 99.78, 137.70 and 73.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99.78 : 137.70 = 73.59 : x
2. Step 2: Convert to fraction form
   99.78/137.70 = 73.59/x
3. Step 3: Cross multiply
   99.78x = 137.70 × 73.59
4. Step 4: Simplify right side
   99.78x = 10,133.34
5. Step 5: Solve for x
   x = 10,133.34/99.78
6. Step 6: Final answer
   x = 101.56