Finding the Fourth Proportional to 91,786.66, 137,688.18 and 28,607.31

Step by Step Solution

1. Step 1: Write the proportion equation
   91,786.66 : 137,688.18 = 28,607.31 : x
2. Step 2: Convert to fraction form
   91,786.66/137,688.18 = 28,607.31/x
3. Step 3: Cross multiply
   91,786.66x = 137,688.18 × 28,607.31
4. Step 4: Simplify right side
   91,786.66x = 3,938,888,448.60
5. Step 5: Solve for x
   x = 3,938,888,448.60/91,786.66
6. Step 6: Final answer
   x = 42,913.52