Finding the Fourth Proportional to 42,731.01, 64,091.48 and 26,889.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,731.01 : 64,091.48 = 26,889.30 : x
2. Step 2: Convert to fraction form
   42,731.01/64,091.48 = 26,889.30/x
3. Step 3: Cross multiply
   42,731.01x = 64,091.48 × 26,889.30
4. Step 4: Simplify right side
   42,731.01x = 1,723,374,898.72
5. Step 5: Solve for x
   x = 1,723,374,898.72/42,731.01
6. Step 6: Final answer
   x = 40,330.78