Finding the Fourth Proportional to 78.59, 108.32 and 53.99

Step by Step Solution

1. Step 1: Write the proportion equation
   78.59 : 108.32 = 53.99 : x
2. Step 2: Convert to fraction form
   78.59/108.32 = 53.99/x
3. Step 3: Cross multiply
   78.59x = 108.32 × 53.99
4. Step 4: Simplify right side
   78.59x = 5,848.40
5. Step 5: Solve for x
   x = 5,848.40/78.59
6. Step 6: Final answer
   x = 74.41