Finding the Fourth Proportional to 42,513.21, 63,766.46 and 12,931.00

Step by Step Solution

1. Step 1: Write the proportion equation
   42,513.21 : 63,766.46 = 12,931.00 : x
2. Step 2: Convert to fraction form
   42,513.21/63,766.46 = 12,931.00/x
3. Step 3: Cross multiply
   42,513.21x = 63,766.46 × 12,931.00
4. Step 4: Simplify right side
   42,513.21x = 824,563,967.17
5. Step 5: Solve for x
   x = 824,563,967.17/42,513.21
6. Step 6: Final answer
   x = 19,395.48