Finding the Fourth Proportional to 85,588.86, 128,395.59 and 26,429.10

Step by Step Solution

1. Step 1: Write the proportion equation
   85,588.86 : 128,395.59 = 26,429.10 : x
2. Step 2: Convert to fraction form
   85,588.86/128,395.59 = 26,429.10/x
3. Step 3: Cross multiply
   85,588.86x = 128,395.59 × 26,429.10
4. Step 4: Simplify right side
   85,588.86x = 3,393,379,887.67
5. Step 5: Solve for x
   x = 3,393,379,887.67/85,588.86
6. Step 6: Final answer
   x = 39,647.45