Finding the Fourth Proportional to 42,821,394.99, 64,245,925.56 and 19,807,426.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,821,394.99 : 64,245,925.56 = 19,807,426.20 : x
2. Step 2: Convert to fraction form
   42,821,394.99/64,245,925.56 = 19,807,426.20/x
3. Step 3: Cross multiply
   42,821,394.99x = 64,245,925.56 × 19,807,426.20
4. Step 4: Simplify right side
   42,821,394.99x = 1,272,546,429,364,933.50
5. Step 5: Solve for x
   x = 1,272,546,429,364,933.50/42,821,394.99
6. Step 6: Final answer
   x = 29,717,537.92