Finding the Fourth Proportional to 38,641.78, 53,322.96 and 21,643.12

Step by Step Solution

1. Step 1: Write the proportion equation
   38,641.78 : 53,322.96 = 21,643.12 : x
2. Step 2: Convert to fraction form
   38,641.78/53,322.96 = 21,643.12/x
3. Step 3: Cross multiply
   38,641.78x = 53,322.96 × 21,643.12
4. Step 4: Simplify right side
   38,641.78x = 1,154,075,222.04
5. Step 5: Solve for x
   x = 1,154,075,222.04/38,641.78
6. Step 6: Final answer
   x = 29,866.00