Finding the Fourth Proportional to 91,323.51, 136,985.63 and 28,143.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91,323.51 : 136,985.63 = 28,143.15 : x
2. Step 2: Convert to fraction form
   91,323.51/136,985.63 = 28,143.15/x
3. Step 3: Cross multiply
   91,323.51x = 136,985.63 × 28,143.15
4. Step 4: Simplify right side
   91,323.51x = 3,855,206,992.22
5. Step 5: Solve for x
   x = 3,855,206,992.22/91,323.51
6. Step 6: Final answer
   x = 42,214.84