Finding the Fourth Proportional to 83,483.40, 115,257.78 and 64,667.40

Step by Step Solution

1. Step 1: Write the proportion equation
   83,483.40 : 115,257.78 = 64,667.40 : x
2. Step 2: Convert to fraction form
   83,483.40/115,257.78 = 64,667.40/x
3. Step 3: Cross multiply
   83,483.40x = 115,257.78 × 64,667.40
4. Step 4: Simplify right side
   83,483.40x = 7,453,420,962.37
5. Step 5: Solve for x
   x = 7,453,420,962.37/83,483.40
6. Step 6: Final answer
   x = 89,280.28