Finding the Fourth Proportional to 85,948.58, 128,929.08 and 35,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85,948.58 : 128,929.08 = 35,978.42 : x
2. Step 2: Convert to fraction form
   85,948.58/128,929.08 = 35,978.42/x
3. Step 3: Cross multiply
   85,948.58x = 128,929.08 × 35,978.42
4. Step 4: Simplify right side
   85,948.58x = 4,638,664,590.45
5. Step 5: Solve for x
   x = 4,638,664,590.45/85,948.58
6. Step 6: Final answer
   x = 53,970.23