Finding the Fourth Proportional to 42,912.50, 64,368.84 and 18,288.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,912.50 : 64,368.84 = 18,288.50 : x
2. Step 2: Convert to fraction form
   42,912.50/64,368.84 = 18,288.50/x
3. Step 3: Cross multiply
   42,912.50x = 64,368.84 × 18,288.50
4. Step 4: Simplify right side
   42,912.50x = 1,177,209,530.34
5. Step 5: Solve for x
   x = 1,177,209,530.34/42,912.50
6. Step 6: Final answer
   x = 27,432.79