Finding the Fourth Proportional to 30,530.08, 42,117.42 and 19,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,530.08 : 42,117.42 = 19,778.50 : x
2. Step 2: Convert to fraction form
   30,530.08/42,117.42 = 19,778.50/x
3. Step 3: Cross multiply
   30,530.08x = 42,117.42 × 19,778.50
4. Step 4: Simplify right side
   30,530.08x = 833,019,391.47
5. Step 5: Solve for x
   x = 833,019,391.47/30,530.08
6. Step 6: Final answer
   x = 27,285.20