Finding the Fourth Proportional to 139,746.35, 209,645.06 and 64,856.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,746.35 : 209,645.06 = 64,856.18 : x
2. Step 2: Convert to fraction form
   139,746.35/209,645.06 = 64,856.18/x
3. Step 3: Cross multiply
   139,746.35x = 209,645.06 × 64,856.18
4. Step 4: Simplify right side
   139,746.35x = 13,596,777,947.30
5. Step 5: Solve for x
   x = 13,596,777,947.30/139,746.35
6. Step 6: Final answer
   x = 97,296.12