Finding the Fourth Proportional to 91,200.06, 136,821.15 and 28,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   91,200.06 : 136,821.15 = 28,870.56 : x
2. Step 2: Convert to fraction form
   91,200.06/136,821.15 = 28,870.56/x
3. Step 3: Cross multiply
   91,200.06x = 136,821.15 × 28,870.56
4. Step 4: Simplify right side
   91,200.06x = 3,950,103,220.34
5. Step 5: Solve for x
   x = 3,950,103,220.34/91,200.06
6. Step 6: Final answer
   x = 43,312.51