Finding the Fourth Proportional to 30,565.10, 42,820.30 and 30,565.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,565.10 : 42,820.30 = 30,565.10 : x
2. Step 2: Convert to fraction form
   30,565.10/42,820.30 = 30,565.10/x
3. Step 3: Cross multiply
   30,565.10x = 42,820.30 × 30,565.10
4. Step 4: Simplify right side
   30,565.10x = 1,308,806,751.53
5. Step 5: Solve for x
   x = 1,308,806,751.53/30,565.10
6. Step 6: Final answer
   x = 42,820.30