Finding the Fourth Proportional to 42,681.91, 64,014.03 and 12,696.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,681.91 : 64,014.03 = 12,696.32 : x
2. Step 2: Convert to fraction form
   42,681.91/64,014.03 = 12,696.32/x
3. Step 3: Cross multiply
   42,681.91x = 64,014.03 × 12,696.32
4. Step 4: Simplify right side
   42,681.91x = 812,742,609.37
5. Step 5: Solve for x
   x = 812,742,609.37/42,681.91
6. Step 6: Final answer
   x = 19,041.85