Finding the Fourth Proportional to 21,312,796.47, 29,413,938.42 and 13,058,336.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,312,796.47 : 29,413,938.42 = 13,058,336.76 : x
2. Step 2: Convert to fraction form
   21,312,796.47/29,413,938.42 = 13,058,336.76/x
3. Step 3: Cross multiply
   21,312,796.47x = 29,413,938.42 × 13,058,336.76
4. Step 4: Simplify right side
   21,312,796.47x = 384,097,113,326,262.31
5. Step 5: Solve for x
   x = 384,097,113,326,262.31/21,312,796.47
6. Step 6: Final answer
   x = 18,021,901.25