Finding the Fourth Proportional to 56.00, 77.17 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   56.00 : 77.17 = 42.18 : x
2. Step 2: Convert to fraction form
   56.00/77.17 = 42.18/x
3. Step 3: Cross multiply
   56.00x = 77.17 × 42.18
4. Step 4: Simplify right side
   56.00x = 3,254.82
5. Step 5: Solve for x
   x = 3,254.82/56.00
6. Step 6: Final answer
   x = 58.13