Finding the Fourth Proportional to 427,263.10, 640,931.24 and 111,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   427,263.10 : 640,931.24 = 111,719.50 : x
2. Step 2: Convert to fraction form
   427,263.10/640,931.24 = 111,719.50/x
3. Step 3: Cross multiply
   427,263.10x = 640,931.24 × 111,719.50
4. Step 4: Simplify right side
   427,263.10x = 71,604,517,667.18
5. Step 5: Solve for x
   x = 71,604,517,667.18/427,263.10
6. Step 6: Final answer
   x = 167,588.82