Finding the Fourth Proportional to 139,605.51, 209,431.79 and 64,695.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139,605.51 : 209,431.79 = 64,695.27 : x
2. Step 2: Convert to fraction form
   139,605.51/209,431.79 = 64,695.27/x
3. Step 3: Cross multiply
   139,605.51x = 209,431.79 × 64,695.27
4. Step 4: Simplify right side
   139,605.51x = 13,549,245,877.16
5. Step 5: Solve for x
   x = 13,549,245,877.16/139,605.51
6. Step 6: Final answer
   x = 97,053.80