Finding the Fourth Proportional to 42,674.52, 64,006.15 and 12,688.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,674.52 : 64,006.15 = 12,688.14 : x
2. Step 2: Convert to fraction form
   42,674.52/64,006.15 = 12,688.14/x
3. Step 3: Cross multiply
   42,674.52x = 64,006.15 × 12,688.14
4. Step 4: Simplify right side
   42,674.52x = 812,118,992.06
5. Step 5: Solve for x
   x = 812,118,992.06/42,674.52
6. Step 6: Final answer
   x = 19,030.54