Finding the Fourth Proportional to 42,428.72, 63,618.75 and 17,485.99

Step by Step Solution

1. Step 1: Write the proportion equation
   42,428.72 : 63,618.75 = 17,485.99 : x
2. Step 2: Convert to fraction form
   42,428.72/63,618.75 = 17,485.99/x
3. Step 3: Cross multiply
   42,428.72x = 63,618.75 × 17,485.99
4. Step 4: Simplify right side
   42,428.72x = 1,112,436,667.27
5. Step 5: Solve for x
   x = 1,112,436,667.27/42,428.72
6. Step 6: Final answer
   x = 26,218.95