Finding the Fourth Proportional to 139,595.76, 209,417.16 and 64,685.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,595.76 : 209,417.16 = 64,685.52 : x
2. Step 2: Convert to fraction form
   139,595.76/209,417.16 = 64,685.52/x
3. Step 3: Cross multiply
   139,595.76x = 209,417.16 × 64,685.52
4. Step 4: Simplify right side
   139,595.76x = 13,546,257,891.52
5. Step 5: Solve for x
   x = 13,546,257,891.52/139,595.76
6. Step 6: Final answer
   x = 97,039.18