Finding the Fourth Proportional to 91,111.86, 136,672.65 and 28,777.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,111.86 : 136,672.65 = 28,777.50 : x
2. Step 2: Convert to fraction form
   91,111.86/136,672.65 = 28,777.50/x
3. Step 3: Cross multiply
   91,111.86x = 136,672.65 × 28,777.50
4. Step 4: Simplify right side
   91,111.86x = 3,933,097,185.38
5. Step 5: Solve for x
   x = 3,933,097,185.38/91,111.86
6. Step 6: Final answer
   x = 43,167.79