Finding the Fourth Proportional to 30,748.86, 42,434.28 and 18,811.98

Step by Step Solution

1. Step 1: Write the proportion equation
   30,748.86 : 42,434.28 = 18,811.98 : x
2. Step 2: Convert to fraction form
   30,748.86/42,434.28 = 18,811.98/x
3. Step 3: Cross multiply
   30,748.86x = 42,434.28 × 18,811.98
4. Step 4: Simplify right side
   30,748.86x = 798,272,826.67
5. Step 5: Solve for x
   x = 798,272,826.67/30,748.86
6. Step 6: Final answer
   x = 25,961.05