Finding the Fourth Proportional to 28,530.48, 42,799.95 and 9,815.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,530.48 : 42,799.95 = 9,815.34 : x
2. Step 2: Convert to fraction form
   28,530.48/42,799.95 = 9,815.34/x
3. Step 3: Cross multiply
   28,530.48x = 42,799.95 × 9,815.34
4. Step 4: Simplify right side
   28,530.48x = 420,096,061.23
5. Step 5: Solve for x
   x = 420,096,061.23/28,530.48
6. Step 6: Final answer
   x = 14,724.47