Finding the Fourth Proportional to 53.34, 79.50 and 51.72

Step by Step Solution

1. Step 1: Write the proportion equation
   53.34 : 79.50 = 51.72 : x
2. Step 2: Convert to fraction form
   53.34/79.50 = 51.72/x
3. Step 3: Cross multiply
   53.34x = 79.50 × 51.72
4. Step 4: Simplify right side
   53.34x = 4,111.74
5. Step 5: Solve for x
   x = 4,111.74/53.34
6. Step 6: Final answer
   x = 77.09