Finding the Fourth Proportional to 30,978.05, 42,748.56 and 16,830.59

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.05 : 42,748.56 = 16,830.59 : x
2. Step 2: Convert to fraction form
   30,978.05/42,748.56 = 16,830.59/x
3. Step 3: Cross multiply
   30,978.05x = 42,748.56 × 16,830.59
4. Step 4: Simplify right side
   30,978.05x = 719,483,272.71
5. Step 5: Solve for x
   x = 719,483,272.71/30,978.05
6. Step 6: Final answer
   x = 23,225.59