Finding the Fourth Proportional to 28,008.12, 42,012.18 and 7,230

Step by Step Solution

1. Step 1: Write the proportion equation
   28,008.12 : 42,012.18 = 7,230 : x
2. Step 2: Convert to fraction form
   28,008.12/42,012.18 = 7,230/x
3. Step 3: Cross multiply
   28,008.12x = 42,012.18 × 7,230
4. Step 4: Simplify right side
   28,008.12x = 303,748,061.40
5. Step 5: Solve for x
   x = 303,748,061.40/28,008.12
6. Step 6: Final answer
   x = 10,845