Finding the Fourth Proportional to 139,279.33, 208,769.88 and 64,312.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,279.33 : 208,769.88 = 64,312.21 : x
2. Step 2: Convert to fraction form
   139,279.33/208,769.88 = 64,312.21/x
3. Step 3: Cross multiply
   139,279.33x = 208,769.88 × 64,312.21
4. Step 4: Simplify right side
   139,279.33x = 13,426,451,320.39
5. Step 5: Solve for x
   x = 13,426,451,320.39/139,279.33
6. Step 6: Final answer
   x = 96,399.46