Finding the Fourth Proportional to 139,147.23, 208,442.61 and 64,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,147.23 : 208,442.61 = 64,164.72 : x
2. Step 2: Convert to fraction form
   139,147.23/208,442.61 = 64,164.72/x
3. Step 3: Cross multiply
   139,147.23x = 208,442.61 × 64,164.72
4. Step 4: Simplify right side
   139,147.23x = 13,374,661,706.72
5. Step 5: Solve for x
   x = 13,374,661,706.72/139,147.23
6. Step 6: Final answer
   x = 96,118.78