Finding the Fourth Proportional to 85,846.83, 128,788.71 and 28,926.40

Step by Step Solution

1. Step 1: Write the proportion equation
   85,846.83 : 128,788.71 = 28,926.40 : x
2. Step 2: Convert to fraction form
   85,846.83/128,788.71 = 28,926.40/x
3. Step 3: Cross multiply
   85,846.83x = 128,788.71 × 28,926.40
4. Step 4: Simplify right side
   85,846.83x = 3,725,393,740.94
5. Step 5: Solve for x
   x = 3,725,393,740.94/85,846.83
6. Step 6: Final answer
   x = 43,395.82