Finding the Fourth Proportional to 166,783.31, 249,748.70 and 91,821.05

Step by Step Solution

1. Step 1: Write the proportion equation
   166,783.31 : 249,748.70 = 91,821.05 : x
2. Step 2: Convert to fraction form
   166,783.31/249,748.70 = 91,821.05/x
3. Step 3: Cross multiply
   166,783.31x = 249,748.70 × 91,821.05
4. Step 4: Simplify right side
   166,783.31x = 22,932,187,870.14
5. Step 5: Solve for x
   x = 22,932,187,870.14/166,783.31
6. Step 6: Final answer
   x = 137,496.90