Finding the Fourth Proportional to 85,430.72, 128,158.32 and 26,271.34

Step by Step Solution

1. Step 1: Write the proportion equation
   85,430.72 : 128,158.32 = 26,271.34 : x
2. Step 2: Convert to fraction form
   85,430.72/128,158.32 = 26,271.34/x
3. Step 3: Cross multiply
   85,430.72x = 128,158.32 × 26,271.34
4. Step 4: Simplify right side
   85,430.72x = 3,366,890,798.55
5. Step 5: Solve for x
   x = 3,366,890,798.55/85,430.72
6. Step 6: Final answer
   x = 39,410.77