Finding the Fourth Proportional to 61,131.38, 91,710.90 and 21,688.54

Step by Step Solution

1. Step 1: Write the proportion equation
   61,131.38 : 91,710.90 = 21,688.54 : x
2. Step 2: Convert to fraction form
   61,131.38/91,710.90 = 21,688.54/x
3. Step 3: Cross multiply
   61,131.38x = 91,710.90 × 21,688.54
4. Step 4: Simplify right side
   61,131.38x = 1,989,075,523.09
5. Step 5: Solve for x
   x = 1,989,075,523.09/61,131.38
6. Step 6: Final answer
   x = 32,537.72