Finding the Fourth Proportional to 30,580.74, 42,225.30 and 19,830.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,580.74 : 42,225.30 = 19,830.78 : x
2. Step 2: Convert to fraction form
   30,580.74/42,225.30 = 19,830.78/x
3. Step 3: Cross multiply
   30,580.74x = 42,225.30 × 19,830.78
4. Step 4: Simplify right side
   30,580.74x = 837,360,634.73
5. Step 5: Solve for x
   x = 837,360,634.73/30,580.74
6. Step 6: Final answer
   x = 27,381.96