Finding the Fourth Proportional to 42,971,760, 64,459,418.76 and 12,679,623

Step by Step Solution

1. Step 1: Write the proportion equation
   42,971,760 : 64,459,418.76 = 12,679,623 : x
2. Step 2: Convert to fraction form
   42,971,760/64,459,418.76 = 12,679,623/x
3. Step 3: Cross multiply
   42,971,760x = 64,459,418.76 × 12,679,623
4. Step 4: Simplify right side
   42,971,760x = 817,321,128,675,927.50
5. Step 5: Solve for x
   x = 817,321,128,675,927.50/42,971,760
6. Step 6: Final answer
   x = 19,019,959.36