Finding the Fourth Proportional to 139,788.06, 209,366.64 and 64,750.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788.06 : 209,366.64 = 64,750.56 : x
2. Step 2: Convert to fraction form
   139,788.06/209,366.64 = 64,750.56/x
3. Step 3: Cross multiply
   139,788.06x = 209,366.64 × 64,750.56
4. Step 4: Simplify right side
   139,788.06x = 13,556,607,185.32
5. Step 5: Solve for x
   x = 13,556,607,185.32/139,788.06
6. Step 6: Final answer
   x = 96,979.72