Finding the Fourth Proportional to 28,181.57, 42,278.83 and 8,460.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,181.57 : 42,278.83 = 8,460.50 : x
2. Step 2: Convert to fraction form
   28,181.57/42,278.83 = 8,460.50/x
3. Step 3: Cross multiply
   28,181.57x = 42,278.83 × 8,460.50
4. Step 4: Simplify right side
   28,181.57x = 357,699,808.67
5. Step 5: Solve for x
   x = 357,699,808.67/28,181.57
6. Step 6: Final answer
   x = 12,692.69