Finding the Fourth Proportional to 28,045.21, 42,058.72 and 9,320.22

Step by Step Solution

1. Step 1: Write the proportion equation
   28,045.21 : 42,058.72 = 9,320.22 : x
2. Step 2: Convert to fraction form
   28,045.21/42,058.72 = 9,320.22/x
3. Step 3: Cross multiply
   28,045.21x = 42,058.72 × 9,320.22
4. Step 4: Simplify right side
   28,045.21x = 391,996,523.32
5. Step 5: Solve for x
   x = 391,996,523.32/28,045.21
6. Step 6: Final answer
   x = 13,977.31