Finding the Fourth Proportional to 42,994.50, 64,491.74 and 28,200

Step by Step Solution

1. Step 1: Write the proportion equation
   42,994.50 : 64,491.74 = 28,200 : x
2. Step 2: Convert to fraction form
   42,994.50/64,491.74 = 28,200/x
3. Step 3: Cross multiply
   42,994.50x = 64,491.74 × 28,200
4. Step 4: Simplify right side
   42,994.50x = 1,818,667,068
5. Step 5: Solve for x
   x = 1,818,667,068/42,994.50
6. Step 6: Final answer
   x = 42,299.99