Finding the Fourth Proportional to 28,036.21, 42,047.15 and 8,310.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,036.21 : 42,047.15 = 8,310.15 : x
2. Step 2: Convert to fraction form
   28,036.21/42,047.15 = 8,310.15/x
3. Step 3: Cross multiply
   28,036.21x = 42,047.15 × 8,310.15
4. Step 4: Simplify right side
   28,036.21x = 349,418,123.57
5. Step 5: Solve for x
   x = 349,418,123.57/28,036.21
6. Step 6: Final answer
   x = 12,463.10