Finding the Fourth Proportional to 156,025.14, 215,314.50 and 84,405

Step by Step Solution

1. Step 1: Write the proportion equation
   156,025.14 : 215,314.50 = 84,405 : x
2. Step 2: Convert to fraction form
   156,025.14/215,314.50 = 84,405/x
3. Step 3: Cross multiply
   156,025.14x = 215,314.50 × 84,405
4. Step 4: Simplify right side
   156,025.14x = 18,173,620,372.50
5. Step 5: Solve for x
   x = 18,173,620,372.50/156,025.14
6. Step 6: Final answer
   x = 116,478.80