Finding the Fourth Proportional to 86,404.70, 121,316.50 and 86,404.70

Step by Step Solution

1. Step 1: Write the proportion equation
   86,404.70 : 121,316.50 = 86,404.70 : x
2. Step 2: Convert to fraction form
   86,404.70/121,316.50 = 86,404.70/x
3. Step 3: Cross multiply
   86,404.70x = 121,316.50 × 86,404.70
4. Step 4: Simplify right side
   86,404.70x = 10,482,315,787.55
5. Step 5: Solve for x
   x = 10,482,315,787.55/86,404.70
6. Step 6: Final answer
   x = 121,316.50