Finding the Fourth Proportional to 42,685.30, 64,080.60 and 26,890.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,685.30 : 64,080.60 = 26,890.30 : x
2. Step 2: Convert to fraction form
   42,685.30/64,080.60 = 26,890.30/x
3. Step 3: Cross multiply
   42,685.30x = 64,080.60 × 26,890.30
4. Step 4: Simplify right side
   42,685.30x = 1,723,146,558.18
5. Step 5: Solve for x
   x = 1,723,146,558.18/42,685.30
6. Step 6: Final answer
   x = 40,368.62