Finding the Fourth Proportional to 153,969.72, 212,431.78 and 89,426.51

Step by Step Solution

1. Step 1: Write the proportion equation
   153,969.72 : 212,431.78 = 89,426.51 : x
2. Step 2: Convert to fraction form
   153,969.72/212,431.78 = 89,426.51/x
3. Step 3: Cross multiply
   153,969.72x = 212,431.78 × 89,426.51
4. Step 4: Simplify right side
   153,969.72x = 18,997,032,698.49
5. Step 5: Solve for x
   x = 18,997,032,698.49/153,969.72
6. Step 6: Final answer
   x = 123,381.61