Finding the Fourth Proportional to 83.72, 115.55 and 51.00

Step by Step Solution

1. Step 1: Write the proportion equation
   83.72 : 115.55 = 51.00 : x
2. Step 2: Convert to fraction form
   83.72/115.55 = 51.00/x
3. Step 3: Cross multiply
   83.72x = 115.55 × 51.00
4. Step 4: Simplify right side
   83.72x = 5,892.89
5. Step 5: Solve for x
   x = 5,892.89/83.72
6. Step 6: Final answer
   x = 70.39