Finding the Fourth Proportional to 13,139,008.63, 19,587,061.46 and 12,931,943.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139,008.63 : 19,587,061.46 = 12,931,943.47 : x
2. Step 2: Convert to fraction form
   13,139,008.63/19,587,061.46 = 12,931,943.47/x
3. Step 3: Cross multiply
   13,139,008.63x = 19,587,061.46 × 12,931,943.47
4. Step 4: Simplify right side
   13,139,008.63x = 253,298,771,430,508.25
5. Step 5: Solve for x
   x = 253,298,771,430,508.25/13,139,008.63
6. Step 6: Final answer
   x = 19,278,377.74