Finding the Fourth Proportional to 78.00, 107.55 and 53.39

Step by Step Solution

1. Step 1: Write the proportion equation
   78.00 : 107.55 = 53.39 : x
2. Step 2: Convert to fraction form
   78.00/107.55 = 53.39/x
3. Step 3: Cross multiply
   78.00x = 107.55 × 53.39
4. Step 4: Simplify right side
   78.00x = 5,741.83
5. Step 5: Solve for x
   x = 5,741.83/78.00
6. Step 6: Final answer
   x = 73.62