Finding the Fourth Proportional to 103,653.72, 155,280.15 and 86,813.82

Step by Step Solution

1. Step 1: Write the proportion equation
   103,653.72 : 155,280.15 = 86,813.82 : x
2. Step 2: Convert to fraction form
   103,653.72/155,280.15 = 86,813.82/x
3. Step 3: Cross multiply
   103,653.72x = 155,280.15 × 86,813.82
4. Step 4: Simplify right side
   103,653.72x = 13,480,462,991.67
5. Step 5: Solve for x
   x = 13,480,462,991.67/103,653.72
6. Step 6: Final answer
   x = 130,052.86