Finding the Fourth Proportional to 42,158, 63,204.12 and 21,106.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,158 : 63,204.12 = 21,106.40 : x
2. Step 2: Convert to fraction form
   42,158/63,204.12 = 21,106.40/x
3. Step 3: Cross multiply
   42,158x = 63,204.12 × 21,106.40
4. Step 4: Simplify right side
   42,158x = 1,334,011,438.37
5. Step 5: Solve for x
   x = 1,334,011,438.37/42,158
6. Step 6: Final answer
   x = 31,643.14