Finding the Fourth Proportional to 28,085.11, 42,106.85 and 13,276.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,085.11 : 42,106.85 = 13,276.72 : x
2. Step 2: Convert to fraction form
   28,085.11/42,106.85 = 13,276.72/x
3. Step 3: Cross multiply
   28,085.11x = 42,106.85 × 13,276.72
4. Step 4: Simplify right side
   28,085.11x = 559,040,685.88
5. Step 5: Solve for x
   x = 559,040,685.88/28,085.11
6. Step 6: Final answer
   x = 19,905.24