Finding the Fourth Proportional to 28,488.34, 42,729.15 and 17,927.20

Step by Step Solution

1. Step 1: Write the proportion equation
   28,488.34 : 42,729.15 = 17,927.20 : x
2. Step 2: Convert to fraction form
   28,488.34/42,729.15 = 17,927.20/x
3. Step 3: Cross multiply
   28,488.34x = 42,729.15 × 17,927.20
4. Step 4: Simplify right side
   28,488.34x = 766,014,017.88
5. Step 5: Solve for x
   x = 766,014,017.88/28,488.34
6. Step 6: Final answer
   x = 26,888.69