Finding the Fourth Proportional to 42,688.85, 64,024.10 and 12,695.86

Step by Step Solution

1. Step 1: Write the proportion equation
   42,688.85 : 64,024.10 = 12,695.86 : x
2. Step 2: Convert to fraction form
   42,688.85/64,024.10 = 12,695.86/x
3. Step 3: Cross multiply
   42,688.85x = 64,024.10 × 12,695.86
4. Step 4: Simplify right side
   42,688.85x = 812,841,074.39
5. Step 5: Solve for x
   x = 812,841,074.39/42,688.85
6. Step 6: Final answer
   x = 19,041.07