Finding the Fourth Proportional to 81,656.22, 122,369.45 and 64,942.07

Step by Step Solution

1. Step 1: Write the proportion equation
   81,656.22 : 122,369.45 = 64,942.07 : x
2. Step 2: Convert to fraction form
   81,656.22/122,369.45 = 64,942.07/x
3. Step 3: Cross multiply
   81,656.22x = 122,369.45 × 64,942.07
4. Step 4: Simplify right side
   81,656.22x = 7,946,925,856.04
5. Step 5: Solve for x
   x = 7,946,925,856.04/81,656.22
6. Step 6: Final answer
   x = 97,321.75