Finding the Fourth Proportional to 21,663,816.42, 29,899,128.06 and 13,406,536.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,663,816.42 : 29,899,128.06 = 13,406,536.84 : x
2. Step 2: Convert to fraction form
   21,663,816.42/29,899,128.06 = 13,406,536.84/x
3. Step 3: Cross multiply
   21,663,816.42x = 29,899,128.06 × 13,406,536.84
4. Step 4: Simplify right side
   21,663,816.42x = 400,843,761,820,267.69
5. Step 5: Solve for x
   x = 400,843,761,820,267.69/21,663,816.42
6. Step 6: Final answer
   x = 18,502,915.37