Finding the Fourth Proportional to 56.58, 78.06 and 42.04

Step by Step Solution

1. Step 1: Write the proportion equation
   56.58 : 78.06 = 42.04 : x
2. Step 2: Convert to fraction form
   56.58/78.06 = 42.04/x
3. Step 3: Cross multiply
   56.58x = 78.06 × 42.04
4. Step 4: Simplify right side
   56.58x = 3,281.64
5. Step 5: Solve for x
   x = 3,281.64/56.58
6. Step 6: Final answer
   x = 58.00