Finding the Fourth Proportional to 72,219.63, 99,667.89 and 40,386.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,219.63 : 99,667.89 = 40,386.63 : x
2. Step 2: Convert to fraction form
   72,219.63/99,667.89 = 40,386.63/x
3. Step 3: Cross multiply
   72,219.63x = 99,667.89 × 40,386.63
4. Step 4: Simplify right side
   72,219.63x = 4,025,250,196.31
5. Step 5: Solve for x
   x = 4,025,250,196.31/72,219.63
6. Step 6: Final answer
   x = 55,736.23