Finding the Fourth Proportional to 42,861.10, 64,300.84 and 21,804.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,861.10 : 64,300.84 = 21,804.08 : x
2. Step 2: Convert to fraction form
   42,861.10/64,300.84 = 21,804.08/x
3. Step 3: Cross multiply
   42,861.10x = 64,300.84 × 21,804.08
4. Step 4: Simplify right side
   42,861.10x = 1,402,020,659.43
5. Step 5: Solve for x
   x = 1,402,020,659.43/42,861.10
6. Step 6: Final answer
   x = 32,710.80