Finding the Fourth Proportional to 42,830,826.80, 64,246,238.40 and 12,538,689.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42,830,826.80 : 64,246,238.40 = 12,538,689.68 : x
2. Step 2: Convert to fraction form
   42,830,826.80/64,246,238.40 = 12,538,689.68/x
3. Step 3: Cross multiply
   42,830,826.80x = 64,246,238.40 × 12,538,689.68
4. Step 4: Simplify right side
   42,830,826.80x = 805,563,646,404,899.62
5. Step 5: Solve for x
   x = 805,563,646,404,899.62/42,830,826.80
6. Step 6: Final answer
   x = 18,808,033.99