Finding the Fourth Proportional to 85,881.34, 128,690.63 and 45,906.01

Step by Step Solution

1. Step 1: Write the proportion equation
   85,881.34 : 128,690.63 = 45,906.01 : x
2. Step 2: Convert to fraction form
   85,881.34/128,690.63 = 45,906.01/x
3. Step 3: Cross multiply
   85,881.34x = 128,690.63 × 45,906.01
4. Step 4: Simplify right side
   85,881.34x = 5,907,673,140.72
5. Step 5: Solve for x
   x = 5,907,673,140.72/85,881.34
6. Step 6: Final answer
   x = 68,788.79